Apud IIJIMA Hiromitsu <delmonta@ht.sakura.ne.jp> (sci.lang.japan) hoc legimus:

>Seal shops may offer 実印-sized ones if you want to put many letters on
>your seal, but such seal will not be considered 実印 unless you register
>it by yourself at city office in Japan.

See http://turnbull.sk.tsukuba.ac.jp/banned.html for Stephen Turnbull's
experience with foreigners using seals with kanji on them.

-- 
Jim Breen        http://www.csse.monash.edu.au/~jwb/
Computer Science & Software Engineering,
Monash University, VIC 3800, Australia 
ジム・ブリーン@モナシュ大学